hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip nat translations
Pro Inside global Inside local Outside local Outside global --- 192.0.2.10 10.0.0.10 --- --- --- 192.0.2.11 10.0.0.11 --- --- --- 192.0.2.12 10.0.0.12 --- --- --- 192.0.2.13 10.0.0.13 --- --- --- 192.0.2.14 10.0.0.14 --- --- --- 192.0.2.15 10.0.0.15 --- --- --- 192.0.2.16 10.0.0.16 --- --- --- 192.0.2.17 10.0.0.17 --- --- --- 192.0.2.18 10.0.0.18 --- --- --- 192.0.2.19 10.0.0.19 --- --- --- 192.0.2.20 10.0.0.20 --- ---
R1# show ip nat statistics
Total active translations: 11 (0 static, 11 dynamic; 0 extended) Outside interfaces: GigabitEthernet0/1 Inside interfaces: GigabitEthernet0/0 Hits: 200 Misses: 0 CEF Translated packets: 200, CEF Punted packets: 0 Expired translations: 0 Dynamic mappings: -- Inside Source
[Id] ip nat pool POOL1 192.0.2.10 192.0.2.20 netmask 255.255.255.240
refcount 11 map-id 1
[Id] ip nat inside source list ACL1 pool POOL1
refcount 11
Based on this output, what is the problem?
⚠ Common exam trap
Cisco often tests the distinction between dynamic NAT (one-to-one address mapping) and PAT (many-to-one with port multiplexing), and the trap here is that candidates may assume PAT is always used with a pool, but the output shows no 'extended' translations (PAT entries) and the pool is fully allocated, indicating basic NAT exhaustion.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The NAT pool is exhausted; no addresses are available for new translations.
The output shows 11 active dynamic NAT translations using all 11 addresses from pool POOL1 (192.0.2.10–192.0.2.20, which is a /28 subnet with 14 usable addresses, but the pool is defined from .10 to .20, giving exactly 11 addresses). With no Port Address Translation (PAT) configured, each inside host requires a unique global IP, so once all 11 addresses are in use, no new translations can be created, causing the pool to be exhausted.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The NAT pool is exhausted; no addresses are available for new translations.
Why this is correct
All 11 pool addresses are in use, and the pool has no more addresses. New translations will fail.
- ✗
PAT is not configured, causing address exhaustion.
Why it's wrong here
While PAT could reduce address usage, the pool is correctly sized for 11 hosts; exhaustion is the immediate problem.
- ✗
The inside and outside interfaces are misconfigured.
Why it's wrong here
The statistics show correct interface assignment.
- ✗
Static NAT is conflicting with dynamic NAT.
Why it's wrong here
No static translations are present.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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